/Engine/Source/Runtime/SlateCore/Public/Widgets/SBoxPanel.h
Perform a drop operation onto the target row widget Most commonly used for executing a re-ordering and re-organization operations in lists or trees. e.g. A user was dragging one item into a different spot in the list; they just dropped it. This is our chance to handle the drop by reordering items and calling for a list refresh.
WidgetArgsType & OnAcceptDrop &40; const FOnAcceptDrop & InDelegate &41;